/*
 * @BEGIN LICENSE
 *
 * Psi4: an open-source quantum chemistry software package
 *
 * Copyright (c) 2007-2025 The Psi4 Developers.
 *
 * The copyrights for code used from other parties are included in
 * the corresponding files.
 *
 * This file is part of Psi4.
 *
 * Psi4 is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * Psi4 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with Psi4; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * @END LICENSE
 */

#include "psi4/libtrans/integraltransform.h"
#include "psi4/libpsio/psio.hpp"
#include "defines.h"
#include "occwave.h"

using namespace psi;

namespace psi {
namespace occwave {

void OCCWave::w_int() {
    dpdbuf4 K, W;

    psio_->open(PSIF_LIBTRANS_DPD, PSIO_OPEN_OLD);
    psio_->open(PSIF_OCC_DPD, PSIO_OPEN_OLD);

    //===========================================================================================
    //========================= RHF =============================================================
    //===========================================================================================
    if (reference_ == "RESTRICTED") {
        // W_mbej => W(me,jb) = <mb|ej> = (me|jb)
        global_dpd_->buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), 0,
                               "MO Ints (OV|OV)");
        global_dpd_->buf4_copy(&K, PSIF_OCC_DPD, "W (OV|OV)");
        global_dpd_->buf4_close(&K);

        // W_mbje => W'(me,jb) = <mb|je> = <me|jb>
        global_dpd_->buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), 0,
                               "MO Ints <OV|OV>");
        global_dpd_->buf4_copy(&K, PSIF_OCC_DPD, "W <OV|OV>");
        global_dpd_->buf4_close(&K);

    }  // end if (reference_ == "RESTRICTED")

    //===========================================================================================
    //========================= UHF =============================================================
    //===========================================================================================
    else if (reference_ == "UNRESTRICTED") {
        /*
        // W_MNIJ = <MN||IJ>
        dpd_buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[O,O]"), ID("[O,O]"),
                      ID("[O,O]"), ID("[O,O]"), 0, "MO Ints <OO||OO>");
        dpd_buf4_copy(&K, PSIF_OCC_DPD, "W_1 <OO|OO>");
        dpd_buf4_close(&K);

        // W_mnij = <mn||ij>
        dpd_buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[o,o]"), ID("[o,o]"),
                      ID("[o,o]"), ID("[o,o]"), 0, "MO Ints <oo||oo>");
        dpd_buf4_copy(&K, PSIF_OCC_DPD, "W_1 <oo|oo>");
        dpd_buf4_close(&K);

        // W_MnIj = <Mn|Ij>
        dpd_buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[O,o]"), ID("[O,o]"),
                      ID("[O,o]"), ID("[O,o]"), 0, "MO Ints <Oo|Oo>");
        dpd_buf4_copy(&K, PSIF_OCC_DPD, "W_1 <Oo|Oo>");
        dpd_buf4_close(&K);

        //Print
        if (print_ > 3) {
          dpd_buf4_init(&W, PSIF_OCC_DPD, 0, ID("[O,O]"), ID("[O,O]"),
                      ID("[O,O]"), ID("[O,O]"), 0, "W_1 <OO|OO>");
          dpd_buf4_print(&W, outfile, 1);
          dpd_buf4_close(&W);

          dpd_buf4_init(&W, PSIF_OCC_DPD, 0, ID("[o,o]"), ID("[o,o]"),
                      ID("[o,o]"), ID("[o,o]"), 0, "W_1 <oo|oo>");
          dpd_buf4_print(&W, outfile, 1);
          dpd_buf4_close(&W);

          dpd_buf4_init(&W, PSIF_OCC_DPD, 0, ID("[O,o]"), ID("[O,o]"),
                      ID("[O,o]"), ID("[O,o]"), 0, "W_1 <Oo|Oo>");
          dpd_buf4_print(&W, outfile, 1);
          dpd_buf4_close(&W);
        }



        // W_ABEF = <AB||EF>
        dpd_buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[V,V]"), ID("[V,V]"),
                      ID("[V,V]"), ID("[V,V]"), 0, "MO Ints <VV||VV>");
        dpd_buf4_copy(&K, PSIF_OCC_DPD, "W_1 <VV|VV>");
        dpd_buf4_close(&K);

        // W_abef = <ab||ef>
        dpd_buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[v,v]"), ID("[v,v]"),
                      ID("[v,v]"), ID("[v,v]"), 0, "MO Ints <vv||vv>");
        dpd_buf4_copy(&K, PSIF_OCC_DPD, "W_1 <vv|vv>");
        dpd_buf4_close(&K);

        // W_AbEf = <Ab|Ef>
        dpd_buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[V,v]"), ID("[V,v]"),
                      ID("[V,v]"), ID("[V,v]"), 0, "MO Ints <Vv|Vv>");
        dpd_buf4_copy(&K, PSIF_OCC_DPD, "W_1 <Vv|Vv>");
        dpd_buf4_close(&K);

        //Print
        if (print_ > 3) {
          dpd_buf4_init(&W, PSIF_OCC_DPD, 0, ID("[V,V]"), ID("[V,V]"),
                      ID("[V,V]"), ID("[V,V]"), 0, "W_1 <VV|VV>");
          dpd_buf4_print(&W, outfile, 1);
          dpd_buf4_close(&W);

          dpd_buf4_init(&W, PSIF_OCC_DPD, 0, ID("[v,v]"), ID("[v,v]"),
                      ID("[v,v]"), ID("[v,v]"), 0, "W_1 <vv|vv>");
          dpd_buf4_print(&W, outfile, 1);
          dpd_buf4_close(&W);

          dpd_buf4_init(&W, PSIF_OCC_DPD, 0, ID("[V,v]"), ID("[V,v]"),
                      ID("[V,v]"), ID("[V,v]"), 0, "W_1 <Vv|Vv>");
          dpd_buf4_print(&W, outfile, 1);
          dpd_buf4_close(&W);
        }
        */

        // W_MBEJ => W(ME,JB) = <MB||EJ> = (ME|JB) - <ME|JB>
        global_dpd_->buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), 0,
                               "MO Ints (OV|OV)");
        global_dpd_->buf4_copy(&K, PSIF_OCC_DPD, "W (OV|OV)");
        global_dpd_->buf4_close(&K);
        global_dpd_->buf4_init(&W, PSIF_OCC_DPD, 0, ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), 0, "W (OV|OV)");
        global_dpd_->buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), 0,
                               "MO Ints <OV|OV>");
        global_dpd_->buf4_axpy(&K, &W, -1.0);  // -1.0*K + W -> W
        global_dpd_->buf4_close(&K);
        global_dpd_->buf4_close(&W);

        // W_mbej => W(me,jb) = <mb||ej> = (me|jb) - <me|jb>
        global_dpd_->buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[o,v]"), ID("[o,v]"), ID("[o,v]"), ID("[o,v]"), 0,
                               "MO Ints (ov|ov)");
        global_dpd_->buf4_copy(&K, PSIF_OCC_DPD, "W (ov|ov)");
        global_dpd_->buf4_close(&K);
        global_dpd_->buf4_init(&W, PSIF_OCC_DPD, 0, ID("[o,v]"), ID("[o,v]"), ID("[o,v]"), ID("[o,v]"), 0, "W (ov|ov)");
        global_dpd_->buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[o,v]"), ID("[o,v]"), ID("[o,v]"), ID("[o,v]"), 0,
                               "MO Ints <ov|ov>");
        global_dpd_->buf4_axpy(&K, &W, -1.0);  // -1.0*K + W -> W
        global_dpd_->buf4_close(&K);
        global_dpd_->buf4_close(&W);

        // W_MbEj => W(ME,jb) = <Mb||Ej> = (ME|jb)
        global_dpd_->buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[O,V]"), ID("[o,v]"), ID("[O,V]"), ID("[o,v]"), 0,
                               "MO Ints (OV|ov)");
        global_dpd_->buf4_copy(&K, PSIF_OCC_DPD, "W (OV|ov)");
        global_dpd_->buf4_close(&K);

        // W_MbeJ => W(Me,Jb) = <Mb||eJ> = -(MJ|be)
        global_dpd_->buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[O,O]"), ID("[v,v]"), ID("[O>=O]+"), ID("[v>=v]+"), 0,
                               "MO Ints (OO|vv)");
        global_dpd_->buf4_sort(&K, PSIF_OCC_DPD, psqr, ID("[O,v]"), ID("[O,v]"), "W (Ov|Ov)");
        global_dpd_->buf4_close(&K);
        global_dpd_->buf4_init(&W, PSIF_OCC_DPD, 0, ID("[O,v]"), ID("[O,v]"), ID("[O,v]"), ID("[O,v]"), 0, "W (Ov|Ov)");
        global_dpd_->buf4_scm(&W, -1.0);
        global_dpd_->buf4_close(&W);

        // W_mBEj => W(mE,jB) = <mB||Ej> = -(BE|mj)
        global_dpd_->buf4_init(&K, PSIF_LIBTRANS_DPD, 0, ID("[V,V]"), ID("[o,o]"), ID("[V>=V]+"), ID("[o>=o]+"), 0,
                               "MO Ints (VV|oo)");
        global_dpd_->buf4_sort(&K, PSIF_OCC_DPD, rqsp, ID("[o,V]"), ID("[o,V]"), "W (oV|oV)");
        global_dpd_->buf4_close(&K);
        global_dpd_->buf4_init(&W, PSIF_OCC_DPD, 0, ID("[o,V]"), ID("[o,V]"), ID("[o,V]"), ID("[o,V]"), 0, "W (oV|oV)");
        global_dpd_->buf4_scm(&W, -1.0);
        global_dpd_->buf4_close(&W);

        // it is unnecessary for ocepa, but i will create it so that can use DPD with OOC
        // W_mBeJ => W(me,JB) = <mB||eJ> = (JB|me) = W(JB,me) = W_JeBm
        global_dpd_->buf4_init(&W, PSIF_OCC_DPD, 0, ID("[O,V]"), ID("[o,v]"), ID("[O,V]"), ID("[o,v]"), 0, "W (OV|ov)");
        global_dpd_->buf4_sort(&W, PSIF_OCC_DPD, rspq, ID("[o,v]"), ID("[O,V]"), "W (ov|OV)");
        global_dpd_->buf4_close(&W);

        // Print
        if (print_ > 3) {
            global_dpd_->buf4_init(&W, PSIF_OCC_DPD, 0, ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), ID("[O,V]"), 0,
                                   "W (OV|OV)");
            global_dpd_->buf4_print(&W, "outfile", 1);
            global_dpd_->buf4_close(&W);

            global_dpd_->buf4_init(&W, PSIF_OCC_DPD, 0, ID("[o,v]"), ID("[o,v]"), ID("[o,v]"), ID("[o,v]"), 0,
                                   "W (ov|ov)");
            global_dpd_->buf4_print(&W, "outfile", 1);
            global_dpd_->buf4_close(&W);

            global_dpd_->buf4_init(&W, PSIF_OCC_DPD, 0, ID("[O,V]"), ID("[o,v]"), ID("[O,V]"), ID("[o,v]"), 0,
                                   "W (OV|ov)");
            global_dpd_->buf4_print(&W, "outfile", 1);
            global_dpd_->buf4_close(&W);

            global_dpd_->buf4_init(&W, PSIF_OCC_DPD, 0, ID("[O,v]"), ID("[O,v]"), ID("[O,v]"), ID("[O,v]"), 0,
                                   "W (Ov|Ov)");
            global_dpd_->buf4_print(&W, "outfile", 1);
            global_dpd_->buf4_close(&W);

            global_dpd_->buf4_init(&W, PSIF_OCC_DPD, 0, ID("[o,V]"), ID("[o,V]"), ID("[o,V]"), ID("[o,V]"), 0,
                                   "W (oV|oV)");
            global_dpd_->buf4_print(&W, "outfile", 1);
            global_dpd_->buf4_close(&W);
        }

    }  // end if (reference_ == "UNRESTRICTED")

    psio_->close(PSIF_LIBTRANS_DPD, 1);
    psio_->close(PSIF_OCC_DPD, 1);

}  // end W_int
}
}  // End Namespaces
